As off 13th of December 2018 after the update; Go to the mine highlighted on your map. Kill all the moleman and wait for the machine to appear out of the ground. The boxes that contain ore you can loot will unlock in three batches, for some of them you need the Hornwright senior executive id card. You do not need to loot all the boxes, I didn't as some of them where to high on the machine to reach for me but the achievement stil unlocked anyways.